LWNM (Safety LWCO - non-powered contacts)

PDI’s Series LWNM is a UL353 rated Safety Low-Water Cutoff designed and approved for use as a secondary LWCO for Boilers. It's conductance actuated and available with 10A non-powered contacts. The product is sold as an 11 pin Octal Socket plug-in module only or bundled with a Din Rail mountable socket. The LWNM can also be used in a variety of other liquid level applications for annunciation, alarming, or simple on/off control.

NEW, APPROVED & EXCLUSIVE TO PDI: Optional Manual Lockout Feature for Boilers now available with the LWNM products. It's designed to eliminate nuisance trips (ie; manual lock-outs) on Boilers that can occur and automatically recover within 90 seconds after tripping the Safety Low-Water Cutoff. Saves on costly shut-downs, service calls and allows the highest degree of burner safety protection using a fast 3 second shut down on the burner circuit after water falls off of the low water probe. 

CONTACT PDI TO LEARN MORE AND DISCUSS YOUR APPLICATION RIGHT AWAY.

Applications
  • Safety Low-Water Cutoff
  • Annunciation/Alarm/On-Off Control
  • Boiler/Steam Gen - Gas/Electric
  • Restaurant/Cooking Equipment
  • Food Service Equipment
  • Hot Water Tanks
  • Autoclaves/Sterilizers
  • Cooling Towers/Evaporators
  • Chemical Delivery Equipment
Product Features
  • High Quality Solid State Controls
  • Design, Support, and Made in USA
  • Open PCB for Space/Cost Savings
  • Industry Std 11-Pin Plug-in
  • Auto/Man Reset Feature - Standard
  • Power Outage Feature - Standard
  • Probe Build-up Detection - Standard
  • SPST Non-Powered Contacts - Standard
  • UL353/UL1998/CSD-1 Approved
  • Diagnostic LEDs
  • Configurable Time Delays
  • Conformal Coating option
  • Alternate Test Features option
  • New Alt Manual Lockout option
  • Customs available for OEMs
Specifications
Model
LWNM
Mode of Operation
Direct or Inverse
Sensitivity
26K (std), contact factory for other options
ControlStyle
N/A
SocketStyle
11-Pin Plug-In (Din/Panel Mount)
StandoffStyle
N/A
Enclosure
None
Contact Design
SPST (1 Form A), non-powered
Contact Rating
10A, 120V/240V, 1/3 horse power (hp)
Secondary Voltage
12 VAC nominal
Terminal Style
#6-32 screw terminals w/pressure clamps (module socket)
Number of Channels
1
Minimum Temperature
0F (-17C)
Maximum Temperature
150F (65C)
Supply Voltage
120VAC/220VAC/240VAC
Approvals
UL353/UL1998/CSD-1, UL File # MH46954
Minimum Qty (per Release)
1
Weight (Lbs)
0.5
Certifications
ISO9001, IEC80079-34,
ATEX, IECEx, FM, UL
Established 1991
Contact information
ProtoDesign, Inc.
50495 Corporate Drive,
Suite 106
Utica, MI 48315
Business Hours
Monday–Friday: 8 AM to 5 PM EST